<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>loading6</title>
  <style>
    * {
      box-sizing: border-box;
    }
    .progress{
      width: 120px;
      height:24px;
      -webkit-mask: radial-gradient(circle closest-side,#000 94%,#0000) 0 0/25% 100%,
      linear-gradient(#000 0 0) center/calc(100% - 12px) calc(100% - 12px) no-repeat ;
      background:linear-gradient(#25b09b 0 0) 0/0% no-repeat #ddd;
      animation: p6 2s infinite linear; 
    }
  
    @keyframes p6 {
      100% {
        background-size: 100%;
      }
    }
  </style>
</head>

<body>
  <div class="progress"></div>

</body>

</html>